The CDC is investigating seven multistate outbreaks of Salmonella infections linked to contact with poultry in backyard flocks.

In all, health officials say there have been a reported 324 infections across 35 states ranging from Jan. 4 to May 11.

Laboratory results revealed contact with live poultry was the likely source of all seven outbreaks. Regardless of where they are purchased, CDC says all live poultry can carry Salmonella bacteria.

“Live poultry may have Salmonella germs in their droppings and on their bodies (feathers, feet, and beaks) even when they appear healthy and clean,” CDC says. “The germs can also get on cages, coops, hay, plants, and soil in the area where the birds live and roam.”

Additional testing to determine antibiotic resistance was conducted on one outbreak strain of Salmonella bacteria. In all tests, the bacteria was susceptible to antibiotics.

More information on the outbreaks can be found here.